Animal Kingdom's Odd Couples

Ten-month old Virginia the pig and her dog buddies Luna, left, and Max take a nap on the couch together.

Courtesy Wendy Paulas

Snail Hitches a Ride on Frog Friend

A snail is pictured on the back of a green frog, Aug. 22, 2016 in Batam, Indonesia.

Sijori Images/Barcroft Images

A 16-year-old cat called Rosinka carries a three-week-old baby monkey on her back in Tyumen, Russia, Aug. 20, 2016. The cat adopted the baby squirrel monkey after he was abandoned by his mother at a zoo, comforting the little primate by letting him cling to her back for warmth.

AP

A Tiger and a Goat Chill out in the Snow

Amur the Tiger and Timur the Goat are seen in their aviary in Safari Park in Shkotovo, Russia, Jan. 22, 2016.

Yuri Smityuk/TASS via Getty Images

Meet the Incredible Dog Who Looks After Baby Monkeys

A dog named Princess has befriended a baby monkey. Princess is owned by two conservationists who rescue wildlife from Africa and Asia. She gets along with any creature that is bought into the home and loves to care for anything from pigs to baby monkeys.

Caters News Agency

A gorilla named Koko, known for her sign language abilities, shows maternal instincts with kittens, specifically Ms. Gray.

The Gorilla Foundation/Koko.org

A gorilla named Koko, known for her sign language abilities, shows maternal instincts with kittens, specifically Ms. Gray.

The Gorilla Foundation/Koko.org

Rescued Dog & Chicken Form Inseparable Bond

Roo, left, and Penny Chicken pose for an adorable photo with another dog in Duluth, Georgia. The energetic pooch named Roo has become best friends with silkie chicken, Penny, after they were rescued and re-homed together. They now live with owner Alicia Williams at her house in Duluth, Georgia, and have become inseparable friends.

Alicia Williams/Barcroft Media/Landov

Rottweiler Befriends Tiny Hamster

Pictured are Razor the Rottweiler and Snickers the hamster. A tiny, four-inch hamster has struck up the most unlikely of friendships with a 91-pound Rottweiler. Razor is a one-year-old Rottweiler puppy who would have been sold as a fighting dog if he had not been rescued by owner Ria Mitchell. Yet, in contrast to the life Razor was originally destined for, the "gentle giant" has befriended a Syrian hamster named Snickers.

Mercury Press & Media Ltd/Caters News Agency

Dairy Cows Nuzzle Barn Cat

Dairy cows nuzzle a barn cat as they wait to be milked at a farm in Granby, Quebec, July 26, 2015.

Christinne Muschi/Reuters

Meet the Owl and Kitten Who are Best Friends

Fuku the owl has formed a best friend with Marimo the kitten in Osaka, Japan, June 26, 2015.

Caters News Agency

Tuna, a pot-bellied pig, and Jack are an unusual yet inseparable pair. The two were surrendered to the Humane Society of North Texas when their owners were no longer able to keep them.

Humane Society of North Texas

This Dog Befriended a Menagerie

Bob the golden retriever and birds rest together in Sao Paulo, July 2015.

@bob_goldenretr/REX Shutterstock

Dog and Fawn Share Affectionate Friendship

Hansi, an orphaned fawn, is pictured being loved affectionately by Lia, an Australian shepherd puppy, in this photo that was released on July 2, 2015 in Regensburg, Germany.

Caters News Agency

Labrador and Chameleon Are Inseparable Best Pals

Meet the Labrador and chameleon who make the unlikeliest of best pals. Despite the giant size difference between Winston, a six-year-old yellow lab, and Kammer, a one-year-old lizard, they are completely inseparable. Whether it's eating meals out of bowls next to each other or playing in the garden together, the pet pals can’t be separated. Even when they're not awake they can't be kept apart, with Kammer often taking naps either on or next to Winston's big head.

Caters News Agency

Two Cute! Orangutan Feeds Tiger Cub

Cat Helps Out These Little Puppies

Joe Arpaio @RealSheriffJoe posted this image on Twitter with this caption: "Puppies rescued by deputies r livin' the good life. Fat & happy as MamaCat &amp; inmates share in their care & well being," April 10, 2015.

@RealSheriffJoe/Twitter

Chick Gives Pug a Peck on the Nose

This pug, named Fugly, and chick named KFC, were introduced by their owners who live next door to one another in the Philippines. Fugly's owner Tim Ho took photos of the pair--the owners introduced the pair when they were only a few weeks old, and they immediately bonded.

Tim Ho/Caters News

An Unlikely Pair of Best Friends: A Dog and a Pony

Tigger the pony and Joker the dog have become best friends thanks to the fact they are almost identical after their owner Ronnie Jones introduced them at her stables, Feb. 8, 2015, in Summercourt in Cornwall, UK.

Caters News Agency

Gentle Giant Befriends Tiny Chihuahua

Digby, a tiny Chihuahua who was abandoned and rescued, found an unlikely friend in Nero, a Neapolitan Mastiff, through the RSPCA in London.

Courtesy RSPCA

Dog Nurses Orphaned Tiger Cub

The zoo in Indore, India has arranged for a dog to feed milk to a lone tiger cub, Oct. 3, 2014. The cub was rescued by the zoo officials after her mother was caught mishandling her. The cub is a month old now and as per the zoo department will have to be fed for the next month.

Arun Mondhe/Hindustan Times/Getty Images

Oh Deer! These Two Friends are Too Cute

They might share the same wet noses and cute brown eyes but that's where the similarities should end, but not for four-month-old roe deer Daisy. She has no idea she's not a dog. In fact it's been a real case of puppy love since she was saved by an animal rescue center and befriended by the owners' two dogs. Now the beautiful creature has developed such a friendship with the dogs that she believes she is one of them.

Jeremy Durkin/Rex/REX USA

Stripes and Solids: Dog Mum Feeds Her Pup and Two Lion Cubs

A dog nurses two-day-old tiger cubs and her puppy at a zoo in Hefei, China on Aug. 22, 2014.

Reuters

Best Friends After Life-Saving Rescue

Opie and Roscoe continue to be best friends a year after Opie helped save Roscoe's life.

Courtesy Lia Spilka

The Hero Dog Who Helped Save This Kitten

James Roode was taking his dog, Opie, for a walk last August when the pair discovered a newborn kitten, seen here, who was trapped underneath a log.

Courtesy Lia Spilka

A Roar, a Woof and a Kiss: See This Adorable Lion and Dog Duo

Bonedigger, a five-year old male lion, and Milo, a seven-year old dachshund dog, are so close that Milo nonchalantly licks the massive lion's teeth to clean them.

Barcroft Media /Landov

Bonedigger the lion interacts with his dachshund friend Milo at Exotic Animal Park in Wynnewood, Okla.

Barcroft Media /Landov

Herd of Buffalo Adopt Orphaned Elephant

Nzhou, an elephant whose parents were poached by ivory hunters, has been adopted by a herd of buffalo. Nzhou looks a bit out of place with the herd, as she towers over them, but they accept her as one of their own.

Caters News Agency

Ten-month old Virginia the pig and her dog buddies Max and Luna wait for food from their owner, Wendy Paulas. Paulas, who is from Colorado, adopted Virginia and told ABC News the pig fits right in with her dogs, even adopting their mannerisms.

Courtesy Wendy Paulas

Ten-month old Virginia the pig and her dog buddies Luna, left, and Max take a nap on the couch together.

Courtesy Wendy Paulas

Leo the African Lion, Baloo the American Black Bear and Shere Khan the Bengal Tiger were all born in early 2001 and came to Noah's Ark Animal Sanctuary after being rescued from an Atlanta home basement by police officers during a drug raid. Their bond has lasted as they've grown together, and Baloo, Leo and Shere Khan eat, sleep, play together and groom each other.